Ahmed, M. U., M. A. Ahad, M. Alim, A. S. Ekram, Q. A. A. Masum, S. Tanu, and R. Uddin. “Etiology of Upper Gastrointestinal Haemorrhage in a Teaching Hospital”. TAJ: Journal of Teachers Association, vol. 21, no. 1, Sept. 2009, pp. 53-57, doi:10.3329/taj.v21i1.3220.